Since you cannot do this very little thing, why do you worry about the rest?
²⁷“Consider how the wild flowers grow.  They do not labor or spin.  Yet I tell you, not even Solomon in all his splendor was dressed like one of these. ²⁸ If that is how God clothes the grass of the field, which is here today, and tomorrow is thrown into the fire, how much more will he clothe you—you of little faith!

(Luke 12:26-28 -- NIV)